You Perform a Series of Voltage-Clamp Experiments with 2 MM

Multiple Choice

You perform a series of voltage-clamp experiments with 2 mM extracellular calcium, 0.2 mM extracellular calcium and 0 mM extracellular calcium. You notice that the potassium current increases with each step. What is the origin of this increase?

A) Decreased membrane potential
B) Increased threshold potential
C) Activation of calcium-activated sodium channels
D) Activation of calcium-activated potassium channels
E) Activation of calcium channels